YOKOGAWA ASGW User Manual page 8

Range of function code and number of data with Modbus communication
Function
Read coil status
Read input relay status
Read holding registers
Read input registers
Write coil
Write single register
Loopback test
Force multiple coils
Write
registers
Read devise ID *
*: Device ID consists of vendor, product code and revision number.
Vender : "YOKOGAWA"
Product: "ASIU"
REVISION: "1.01.01" (example)
Update rate:
Accesses to GC1000 /ASIU every 100ms. ASGW supports each read and write requests sequentially.
Read and write is individually performed, so that it is possible to offer one read request and one write
request at the same time.
3-2
Function
Code
1(0x01)
2(0x02)
3(0x03)
4(0x04)
5(0x05)
6(0x06)
8(0x08)
15(0x0F)
multiple 16(0x10)
43(0x2B)
BIT/WORD Maximum data by Master/Client
with one communication packet.
BIT 2000 bits
BIT 2000 bits
WORD 125 words
WORD 125 words
BIT 1 bit
WORD 1 word
WORD 1 word
BIT 800 bits
WORD 100 words
ASCII
string
IM 11B06E01-01